| 11. | Traditionally, the term has been defined on the basis of the shape of the infraorbital canal.
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| 12. | Unlike hystricomorphous and myomorphous rodents, the medial masseter muscle does not pass through the infraorbital canal.
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| 13. | The "'infraorbital canal "'is a orbit that opens on to the maxilla.
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| 14. | Frequently involved structures include the lacrimal glands, extraocular muscles, infraorbital nerve, supraorbital nerve and eyelids.
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| 15. | Alternatively, some texts group rodents into three suborders on the basis of the shape of the infraorbital canal.
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| 16. | This is related to the accumulation of blood and other fluid in the infraorbital groove resulting from nasal congestion.
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| 17. | IONE is defined as the infraorbital nerve diameter being greater than the optic nerve diameter in the coronal plane.
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| 18. | This condition is so pronounced and the snout so narrow in heteromyids that the infraorbital canals from either side connect.
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| 19. | The infraorbital canal is enlarged, presumably allowing for the passage of the medial masseter muscle as with other hystricomorphs.
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| 20. | Above the fossa, the infraorbital canal ends in the infraorbital foramen an opening that transmits the infraorbital vessels and nerve.
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